4.27 meters long with a wheelbase of 2778 mm, the new Class B shows the general proportions of the Vision B CST, from the quasi-single-volume, but without the dynamic and innovative design solutions that had characterized the concept car. In short, nothing escapes the body forward to the final.

As for specifications, should be immediately available six engines, four petrol and two turbodiesel. As regards the former, it is a four-cylinder of a 1.5, 1.7 and 2.0 cc. (The latter both naturally aspirated and turbocharged), respectively, with powers of 95, 116, 136 and 193 hp. The maximum speeds are between 174 and 225 km / h, while the acceleration in the classic sprint from 0 to 100 km / h ranging from 13.2 sec. the slower B 150 to 7.6 sec.